BRITISH FLIES 5 



Wings with a venation ranging from very simple, as in Cccidomyidce 



Fig. 13. — Rhahdophagasalicis. x 14. 



(fig. 13), to very complex, as in Tipula (fig. 14), but always vjith the anal 

 cell wide open and becoming wider open at the wingmargin instead of 



Fig. 14. — Tipitla ivripcnnis i. x 5. 



narrowing as in the Beachyceka, and tliis character at once removes all 

 doubt in such genera as Rhyphus (fig. 15) of the Nemoceka, as compared 



Fig. 15. — rji)jphns jTMbctatus J. x 10. 



with Zej)tis (fig. 16) of the Braciiyceua in which the anal cell is open, 

 though in most Beachyceka the anal cell is closed either at or near the 



Fig. 10. — Lcjitis sculupacca i . x S. 



wingmargin or even withdrawn close to the wing-base. Discal cell rarely 

 present, except in Tipulidce and Rliyphidai. 



